如何使用JavaScript在ReThinkDB中的ReQL中对数组应用过滤器

Question

在以下JSON中,我想选择销售额> 12500的记录.如何在ReThinkDB和ReQL中执行此操作？

JSON是:

{
 "address": {  
    "address_line1":  "Address Line 1" ,
    "address_line2":  "Address Line 2" ,
    "city":  "Kochin" ,
    "country":  "India" ,
    "state":  "Kerala"
  } ,
  "id":  "bbe6a9c4-ad9d-4a69-9743-d5aff115b280" ,
  "name":  "Dealer 1" ,
  "products": [
         {
           "product_name":  "Stabilizer" ,
           "sales": 12000
         } ,
         {
           "product_name":  "Induction Cooker" ,
           "sales": 14000
         }
    ]
   }, {
    "address": {
          "address_line1":  "Address Line 1" ,
          "address_line2":  "Address Line 2" ,
          "city":  "Kochin" ,
          "country":  "India" ,
          "state":  "Kerala"
     } ,
     "id":  "f033a4c2-959c-4e2f-a07d-d1a688100ed7" ,
     "name":  "Dealer 2" ,
     "products": [
           {
            "product_name":  "Stabilizer" ,
            "sales": 13000
           } ,
           {
            "product_name":  "Induction Cooker" ,
            "sales": 11000
           }
      ]

}

Answer 1

要获取任何产品的至少一个销售价值超过12,500的所有文档,您可以在ReQL中使用以下过滤器:

r.table('t')
 .filter(r.row('products').contains(function(product) {
   return product('sales').gt(12500);
 }))

这利用了可以传递函数的事实contains.如果至少返回其中一个元素,则array.contains(fun)返回true完全fun返回.您可以在http://rethinkdb.com/api/javascript/contains/找到更多示例truearray